In this issue, D. Citterio et al. review paper-based inkjet-printed microfluidic devices. What are the strengths and weaknesses of printing functional materials? The Highlight deals with late-stage C–H azidation (M. V. Vita and J. Waser).

In the Communications section, A. N. Alexandrova et al. explain the extraordinary stability of square-planar carbon atoms in surface carbides of cobalt and nickel (see picture). G. M. Clore et al. investigated the dependence of distance distributions derived from EPR spectroscopy (DEER). B. Han et al. succeeded in the synthesis of 2-oxazolidinones from atmospheric CO₂ catalyzed by protic ionic liquids. G. Knizia and J. E. M. N. Klein discuss how electron flow in reaction mechanisms can be observed in ab initio computations.

• Angewandte Chemie 18/2015: Print Media,
  Angew. Chem. Int. Ed. 2015, 54 (18).